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Subject
- Topical Subject: IGS Annual Reports6
- Topical Subject: Geology, Economic4
- Topical Subject: Mines and mineral resources4
- Geographic Subject: Daviess County (Ind.)3
- Geographic Subject: Martin County (Ind.)2
- Geographic Subject: Sullivan County (Ind.)2
- Topical Subject: Geology, Stratigraphic2
- Geographic Subject: Illinois1
- Geographic Subject: Indiana1
- Geographic Subject: Kentucky1
- Topical Subject: Coal1
- Topical Subject: Coal mines and mining1